SL4ZJ is a newer stepping than the other two and also needs 1.75v minimum, while the other two can run at 1.7v. the other two may be functionally the same and just differ in terms of being boxed or not.

i don't know why intel bumped the minimum voltage for these late coppermine steppings, but it's probably because they determined that the CPU microcode bug fixes needed the higher voltage for stability.

auron wrote on 2024-07-05, 17:32:

SL4ZJ is a newer stepping than the other two and also needs 1.75v minimum, while the other two can run at 1.7v. the other two may be functionally the same and just differ in terms of being boxed or not.

i don't know why intel bumped the minimum voltage for these late coppermine steppings, but it's probably because they determined that the CPU microcode bug fixes needed the higher voltage for stability.

Thank you for your response.

Will all three basically run in any motherboard that supports Pentium III CPUs without issue?

they should, the steppings usually aren't mentioned in compatibility lists.

auron wrote on 2024-07-05, 17:41:

they should, the steppings usually aren't mentioned in compatibility lists.

Brilliant, thank you. It is appreciated.

Newer stepping usually indicates better overclocking, but that's still a lottery. Or you can achieve better undervolting results, since none of the 866Mhz parts actually require 1.75V to work.